782 PROCEEJHXCS or TIIF. \.\TIOXAL MUSEUM. VOL. MI. 



I nio ( Theliderma) pnslulata SWAINSON, Treat, on Mai., 1840, p. 271, fig. 54d. 

 *Unio nodulatus SAY, Am. Coucb., VI, 1834. * CONRAD, New F. W. Shells, 1*34, 

 p. 70. *FERUSSAC, Guer. Mag., 1835, p. 28. * CONRAD, Monog., 1837, p. 80, 

 pi. sxv, fig. 1.* KUSTER, Conch. Cab., 1861, p. 254, pi. LXXXVI, fig. 1. 

 * REEVE, Conch. Icon., XVI, 1864, pi. xm, fig. 51. 



* J'nio nodulatns RAFIXESQVE var. j>nn1u1afxn P.KTEL, Conch. Sam., Ill, 1890, p. 161. 



Ohio, Cumberland, and Tennessee river systems; Mississippi River 

 and tributaries from eastern Iowa south to Louisiana; southern 

 Michigan. 



tQUADRULA NODIFERA Conrad. 1 



*Unionodiferu8 CONRAD, Pr.Ac. N. Sci. 1'hila., 1, 1841, p. 19; *.I1. Ac. N. Sci. Phila., 

 VIII, 1842, p. 179; I, 1850, p. 277, pi. xxxvm, figs. 4, 8; *Pr. Ac. N. Sci. 

 Phila., VI, 1853, p. 253. 



Louisiana and eastern Texas. 



tQUADRULA CAHABENSIS Lea. 



*Unio cahabensis LEA, Pr. Ac. N. Sci. Phila., XXIII, 1871, p. 190; "Jl.Ac. N. Sci. 

 Phila., VIII, 1874, p. 17, pi. v, fig. 14; * Obs., XIII, 1874, p. 21, pi. v, fig. 14. 

 *B. II. WRIGHT, Check List, 1888. 



Oahawba Eiver, Alabama. 



tQUADRULA VALLATA Lea. 



* Unio vallahis LEA, Pr. Ac. N. Sci. Phila., XII, 1868, p. 145 ; * Jl. Ac. N. Sci. Phila., 



1869, p. 315, pi. L, fig. 128; * Obs., XII, 1869, p. 75, pi. L, fig. 128. *B. H. 

 WRIGHT, Check List, 1888. 

 *Margaron (Unio) raUafns LEA, Syn., 1870, p. 34. 



Alabama and Black Warrior rivers, Alabama. 



tQUADRULA REFULGENS Lea. 



* Unio refulgent LEA, Pr. Ac. N. Sci. Phila., XII, 1868 r p. 145; * Jl. Ac. N. Sci. Phila., 



VI, 1869, p. 317, pi. LI, fig. 130; * Obs., XII, 1869, p. 77, pi. LI, fig. 130.* B. H. 

 WRIGHT, Check List, 1888. 

 *Margaron ( Unio) refulgens LEA, Syn., 1870, p. 34. 



* Unio pnslulosus CALL (part), Tr. Ac. Sci. St. Louis, VII, 1895, p. 42, pi. xv, figs. 3, 4. 



Mississippi and probably Alabama. 



tQUADRULA HOUSTONENSIS Lea. 



*Unio hoiistoncnsis LEA, Pr. Ac. N. Sci. Phila., Ill, 1859, p. 155; *J1. Ac. N. Sci. 

 Phila., IV, 1860, p. 358, pi. LX, fig. 183; "Ohs., VIII, p. 40, pi. LX, fig. 183. 

 *SOWERBY, Conch. Icon., XVI, 1868, pi. LXXXI, fig. 425. * B. H. WRIGHT, 

 Check List, 1888. 



* Margaron ( Unio) lioustonensi* LEA, Syn., 1870, p. 55. 



Texas, Louisiana, and southern Arkansas. Verdigris River, Kansas? 



1 There are six shells bearing the name J'nio nodiferus Conrad in the Philadelphia 

 Academy of Natural Sciences. Part of them are the same as figured in the Journal, 

 and the rest are probably morion i. 



